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Hole in retina and cancer meds12/26/2023 Among these photoreceptors, rods – responsible for vision in dim light – greatly outnumber cones, which are responsible for bright light vision as well as color perception. Their large eyes and big pupils take in a lot of light, and the size of their retina allows a high number of cells to be involved in light capture and processing. Horses are generally thought to have good vision. This multipart process is further complicated by the fact that the eyes are often in motion – controlled by the extraocular muscles – and that some of the information taken in by the eye is transmitted to the opposite side of the brain. The optic nerve, the optic chiasm (the part of the brain where the optic nerves cross), and the optic tract (a bundle of nerve fibers coming from the optic chiasm) carry these signals to the visual cortex of the brain, where they are integrated into an image that can be perceived by the animal. The incoming light reflected from objects in the environment is bent by the cornea and the lens and hits the retina, the sensory tissue in the back of the eye. “Vision is an incredibly complex, physical and biochemical process, through which light that enters the eye is made into an image by the brain,” Knickelbein says. Please watch Knickelbein’s entire presentation for more extensive information. Kelly Knickelbein explains the basics of equine vision, common diseases, and how best to care for your horse’s eyes. Horses are thought to have good vision – but their large eyes are vulnerable to injury and diseases that can result in the loss of eyesight if they are not properly cared for. Kelly Knickelbein, assistant clinical professor in the section of ophthalmology. This is an accompanying article to a Cornell Equine Seminar presented on Mar.
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